challa veena madhuri_adaptive cruise control

Veena Madhuri ChallaChemnitz University of TechnologyAutomotive Software EngineeringThird Semester

Adaptive Cruise Control

Seminar Automotive Sensors

Chair for Measurement and Sensor TechnologyUniv.-Prof. Dr.-Ing. O. Kanoun

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• Introduction

• Principle and Operation

• Block diagram

• Sensors

• Advantages

• Conclusion

• References




CONTENTS

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INTRODUCTION

Adaptive cruise control that can automatically adjust a car‘s speed

and to maintain a safe following distance.




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PRINCIPLE AND OPERATION OF ACC• Works by detecting the distance and Speed of vehicles ahead by radar sensor.

• Time taken to transmit and receive is the key principle for distance measurement.

• Speed can measured by frequency of the reflected beam by doppler effectWorks.




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BLOCK DIAGRAM OF ACC




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SENSORS USED IN ACC• RADAR

• LASER

• Vision Based Sensor


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INTRODUCTION OF RADAR



•Radio Detection and Ranging.

•Waves are generated, transmitted, reflected and detected.

•Unimpaired by night, fog, clouds and smoke.


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PRINCIPLE OF OPERATION



Transmitter

Receiver

AntennaTarget

Transmitted Wave

Reflected Wave


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PRINCIPLE OF MEASUREMENT



1. Distance Determination

R = c Tr /2

where,

R is range of the target,C is velocity of light,Tr is round trip time.


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2. Pulse Repetition Frequency

PRT = 1/PRF

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3. Maximum unambiguous range


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4. Doppler Shift

•Speed measurement


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Received Power

Transmitted PowerTransmitter Gain Antenna Aperture

Target Cross Section

Propagation Factor

Target Distance

5. Radar Equation

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Basic Radar Types



•Pulse Modulation

•Continuous wave


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PULSE VS CONTINUOUS WAVE RADAR

Pulse RADAR Continuous wave RADAR


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BLOCK DIAGRAM OF PULSE RADAR


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ADVANTAGES OF ACC



• Fuel Efficiency of the vehicle is increased.

• Its very useful for long driving.

• It prevents accidents.

• Wide range of environmental conditions (dirt, fog, rain, ice, darkness).


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CONCLUSION

• ACC system was developed for the purposes of driving safety and comfort.

• It reduces the number of brake and switch operations that are required to the driver.

• As a result, the system reduces the driving burden so that the driver can drive in comfort.




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REFERENCES•INTRODUCTION TO RADAR SYSTEMS Second Edition by Merrill I.

Skolnik,1981

•Radar Systems by PAUL A . LYNN

•http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6153935

• http://www.engineersgarage.com/articles/what-is-radar-technology?

page=2

•http://www.radartutorial.eu/01.basics/rb01.en.html

•http://users.ece.gatech.edu/mrichard/Ch1_FRSP2e.pdf

•http://www.delphi.com/manufacturers/auto/safety/active/adaptive-cruise-

controlSeminar Automotive Sensors



http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6153935

http://www.radartutorial.eu/01.basics/rb01.en.html

http://users.ece.gatech.edu/mrichard/Ch1_FRSP2e.pdf

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THANK YOU

